The Forscan graph above is impossible to read in detail (?) but my version is always to look at demanded vs actual for vane or boost, or fuel pressure etc and for any sensor sanity reading i.e.any parameter that is obviously stupid or doesn't change in the expected way?
Sorry if I'm missing the point.

3 hours ago, Shearers said:

The Forscan graph above is impossible to read in detail (?) but my version is always to look at demanded vs actual for vane or boost, or fuel pressure etc and for any sensor sanity reading i.e.any parameter that is obviously stupid or doesn't change in the expected way?
Sorry if I'm missing the point.

If you click on the image it should open in an eyeball friendly resolution, there’s no commanded fuel pressure PID but from what I can tell it’s fine, the only thing that looks odd to me is the boost pressure at the throttle body sensor at 31psi, but it’s not got any codes other than P0039 with the additional symptom of actuator stuck closed

I downloaded the picture so the resolution must be different, however, I opened it in a separate window and can read it!
My very non-expert comments are probably missing any points but I'll say them any way in case it triggers anything or someone:
Surprised there isn't an demanded fuel pressure for instance - there must be a control algorithm so how does the system know (rhetorical question unless someone can explain) likewise for wastegate?
Wastegate position varies dramatically yet boost pressure hardly changes over lot of the graph (is there a blocked pipe to the sensor or a sensor or wiring issues. At higher revs, it may make sense.
Sometimes they are a mirror image at higher revs but the most erratic swings are at low revs (perhaps that doesn't matter)
If actuator stuck closed then that obviously needs checking/testing (assume, Ha Ha!, dangerous) that it is vacuum operated via a PWM device - more points of failure in vacuum pipes, filter, electrical issues, actuator itself.

I'm having the same problem with my Ford Fiesta 1.0 Petrol Ecoboost Turbo.

It started a few weeks ago; I suspected it was something related to the ignition coils, but from what I've read here, it must be another problem. The engine loses power between 2500 and 3000 rpm.

Any news? Has anyone found a solution?

What do you mean looses power, that's not the issue I'm having I'm afraid.

On 2/13/2026 at 5:11 AM, Shearers said:

I downloaded the picture so the resolution must be different, however, I opened it in a separate window and can read it!
My very non-expert comments are probably missing any points but I'll say them any way in case it triggers anything or someone:
Surprised there isn't an demanded fuel pressure for instance - there must be a control algorithm so how does the system know (rhetorical question unless someone can explain) likewise for wastegate?
Wastegate position varies dramatically yet boost pressure hardly changes over lot of the graph (is there a blocked pipe to the sensor or a sensor or wiring issues. At higher revs, it may make sense.
Sometimes they are a mirror image at higher revs but the most erratic swings are at low revs (perhaps that doesn't matter)
If actuator stuck closed then that obviously needs checking/testing (assume, Ha Ha!, dangerous) that it is vacuum operated via a PWM device - more points of failure in vacuum pipes, filter, electrical issues, actuator itself.

I’ve checked again and there’s definitely no commanded fuel pressure or wastegate PIDs, ran my smoke tester on all the vacuum lines and I can’t find any leaks so I’ve got a throttle body pressure sensor to pick up tomorrow as I believe the one in the car is reading 3psi over the actual pressure, failing that I’ll be trying a PCM firmware update

Last chance... forgotten the details...did you run your smoke tester on the inlet pipework? just in case and...I'd be wary of PCM firmware changes and still amazed that there are no fuel/turbo PIDs but as no one else has come back, so be it, sorry!

Lots of people have had the issue I have described no one ever comes back to any of the forums and says it's been fixed.

2 hours ago, Shearers said:

Last chance... forgotten the details...did you run your smoke tester on the inlet pipework? just in case and...I'd be wary of PCM firmware changes and still amazed that there are no fuel/turbo PIDs but as no one else has come back, so be it, sorry!

I ran the smoke tester on anything remotely related to the turbocharger and found no leaks anywhere

Sorry I'm now out of ideas but still bemused that there aren't enough visible PIDs to do any fault finding.
Does no one on here have any further information before this thread disappears off the bottom of the Current list???

Take it to a ford specialist that's what I'm probably going to do. Firing the parts cannon at it is pointless could have paid for diagnostics with what I've paid in sensors alone so far

@a7mag3ddon, I meant that my car is also misfiring at times, especially between 2500 and 3000 rpm.

Do you think the modifications to the IPC and BCM that we made in the past to enable eco mode might be related?

I'm thinking of taking the car to FORD to have them check the cause of the misfires.

Here's a video I made today:

Mine doesn't miss fire, I don't think anyone on this thread has the same issue as I described in the first post and no it's not to do with IPC/BCM as mine did that long before I swapped it out.

11 hours ago, Felipe Pinelli said:

@a7mag3ddon, I meant that my car is also misfiring at times, especially between 2500 and 3000 rpm.

Do you think the modifications to the IPC and BCM that we made in the past to enable eco mode might be related?

I'm thinking of taking the car to FORD to have them check the cause of the misfires.

Here's a video I made today:

Have you changed plugs and coils?

11 hours ago, Shearers said:

Sorry I'm now out of ideas but still bemused that there aren't enough visible PIDs to do any fault finding.
Does no one on here have any further information before this thread disappears off the bottom of the Current list???

It could be something to do with it being assembled in Thailand, might be some differences in firmware, I’ve been able to see commanded fuel pressure and wastegate PIDs on my Kugas so I got no idea at this point, throttle body pressure sensor replacement has achieved nothing so I guess I’ll keep throwing parts and ideas at it

I bought a smoke test machine and did a test today, I've got a leak from what I believe is the oil breather pipe, does this matter much or do I need to fix it ? I replaced the O ring but still leaks a tiny bit.

Here's a Video.

That doesn't look like a 'tiny' leak to me.

It might all suck together when under vacuum, so difficult to say whether it's causing your issue. But if there is that much additional vacuum being sucked in through there then that will affect the MAP/MAF readings.

It's not this bad now, I've changed the O ring this was when I started the test, and is much much less but I can't build any pressure to test further until i order one. I removed the pipe, cleaned the O ring locator ring, swapped it and refitted.

The part is H1BG-6798-AA so will take a look for one.

New pipe arrived today and was back to being like in my video again BUT now I have 2 pipes I'm going to fabricate a pipe with silicone hose instead which won't leak at all on the end in the video, perhaps it does seal when under vaccume I don't know and no one else seems to know if it's normal either so I'll seal it up completely.

It's not pretty but it works.

Holding the pressure now no leaks, second video shows releasing the pressure to prove it's holding without any leak.

And pressure released

Unfortunately I can't test it properly until I drive to work as it only does it under certain circumstances I.E.. 2500 revs, on a hill, holding pedal so not fully accelerating.